From the README: * Pushing with docker is limited to images that have layers of maximum size 500MB. Refer to maximum request body sizes in your Workers plan.

From the README: * Pushing with docker is limited to images that have layers of maximum size 500MB. Refer to maximum request body sizes in your Workers plan. * To circumvent that limitation, you can manually add the layer and the manifest into the R2 bucket or use a client that is able to chunk uploads in sizes less than 500MB (or the limit that you have in your Workers plan).